How do you add staff members one by one?

You can add staff one by one through the Web Dashboard. 

In Truein Web Dashboard:

Web Dashboard > Staff Directory > Add Staff (User) > Enter Staff Personal Details > Click Next > Enter Staff Employment Details > Click Next > Enter Staff Access Details > Click Next > Select Role > Click Add

Fill in the personal details of the staff member, such as his or her name, mobile, gender, government Identity type, etc. Next, fill in employment details like Staff ID, joining date, etc.

Then, enter the access details, like if a staff member is allowed to take attendance from his or her mobile with Geo-fencing. Finally, assign a role as per hierarchy and then click Add.